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How unique is UUID?
...y because of randomness? Or there are other factors? (e.g. time stamp, ip, etc)
– Weishi Zeng
Jun 5 '16 at 15:54
15
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How to remove from a map while iterating it?
...call, or to swap it to a preincrement "because that's just a style thing", etc.
– Dewi Morgan
Jan 29 '15 at 23:11
4
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How do I change the formatting of numbers on an axis with ggplot?
...are coming out with computer style exponent formatting, i.e. 4e+05, 5e+05, etc. This is obviously unacceptable, so I want to get it to display them as 500,000, 400,000, and so on. Getting a proper exponent notation would also be acceptable.
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Should switch statements always contain a default clause?
...you're going to need to look at the source and the values of the variables etc anyway, and the exception stacktrace will include that line number, so no need to waste your time writing more text into the exception message.
s...
Join vs. sub-query
.... It all depends on the data, indexes, correlation, amount of data, query, etc.
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How to use the CancellationToken property?
... have some logical condition to exit (iterate over all items in collection etc.). So I believe it's better not to mix that conditions as they have different intention.
Cautionary note about avoiding CancellationToken.ThrowIfCancellationRequested():
Comment in question by Eamon Nerbonne:
... r...
Selecting with complex criteria from pandas.DataFrame
...that & operator takes a precedence over operators such as > or < etc. That is why
4 < 5 & 6 > 4
evaluates to False. Therefore if you're using pd.loc, you need to put brackets around your logical statements, otherwise you get an error. That's why do:
df.loc[(df['A'] > 10) ...
What's the best way to share data between activities?
...ashMap of WeakReferences
Persist objects (sqlite, share preferences, file, etc.)
TL;DR: there are two ways of sharing data: passing data in the intent's extras or saving it somewhere else. If data is primitives, Strings or user-defined objects: send it as part of the intent extras (user-defined ob...
What does the caret operator (^) in Python do?
...an do binary numbers by typing 0bX where X is your binary. 0b0001, 0b0010, etc. So, 0b1101 ^ 0b1110 would give you 0b0011 (or 3).
– Jeff
Jul 28 '15 at 23:58
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Why does Math.round(0.49999999999999994) return 1?
...s (CPU, 32- or 64-bit mode).
And, when using round or inverting matrices, etc., these bits can make a huge difference.
x64 output:
10.5 rounded is 11
10.499999999999998 rounded is 10
9.5 rounded is 10
9.499999999999998 rounded is 9
8.5 rounded is 9
8.499999999999998 rounded is 8
7.5 rounded is 8
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